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M. LURKEN May 1, 1928.

AIR HEATER Filed April 24, 1925 Patented May 1, 1928.

UNITED STATES PATENT OFFICE.

ILT'I'EIAS rum, DESSAU, GERMANY, ASSIGNOB TO HUGO. JUNKEBS, 0]

DESSAU, GERMANY. i

nnaraa.

Application fled April 24,1925, Serial lilo. 25,723, and in Germany May1, 1924.

My invention relates to air heaters and more especially to a heater ofthe'circulation type in which a heating element fed with steam or otherheating medium, as an 6 electric current, extends across a chamberthrough which air is drawn or forced by means of a fan or the like, thisair being as a rule taken from the room to be heated and, after itstemperature has been raised by the heater, being returned into the room.

In heaters of this type difiiculties were encountered on account oftheir considerable weight and of the necessity to provide strongbearings for the moving parts, such as the is fan and its drive.

According to my invention, I provide a very simple and self-containedunit of great strength by utilizing the walls of the caslng, whichconnects the heater and the fan, as

supports for these parts. To this end, 1 se cure them to a supportingframe or wall bracket in such manner that they form the only connectionbetween the frame and the other parts. a

A particularly useful construction is obtained by arranging the heatingelement in horizontal position in the bottom portion of the air chamber,an air inlet being formed in one of the walls of the chamber and the fanbeing arranged in this opening. The

roof portion of the casing enclosing the chamber is preferably arched soas to strengthen it and to enable it to support the motor. Preferablythe arched roof projects 5 beyond the wall in which the fan is ar- Iranged, and a frame supporting the fan is suspended from thisprojection. If the fan is directly driven by a motor, the motor willalso be suspended from the projecting 4o roof and will be surrounded bythe air discharged by the fan. The danger of the motor being overheatedis overcome by providing the fan with a boss of large diameter, therebypreventing the hot air from imping- 5 ing directly on the motor. Themotor may further be surrounded by a nozzle which extends into thevicinity of the circumference of the boss of the fan and conductscooling air through the motor by suction.

In the drawings aflixed to this specification and forming part thereof,a device embodyinfi my invention is illustrated diagrammatica y by wayof example.

In the drawings, 7 55 Fig. 1 is a cross section, and

Fig. 2 is a front end elevation.

Referring to the drawings, 1 is a ribbed heating element or radiator, 2is the air chamber, 3 is the fan and 4 its motor. 5 is a strong frame orbracket serving to secure the heater to the wall. The bracket 5 ispreferably made of angle iron in the shape of an inverted U. U, 6 arebolts or the like which hold the bracket on the wall.

The lateral walls of the casing enclosing the chamber 2 are secured tothe frame 5. The arched top portion or roof surrounds the fan 3. 8 isthe fiat front wall in which a'circular opening for the fan is provided.The arched roof 20 projects beyond the front wall at 9 and carries aframe 10 supporting the motor 4 which is directly coupled with the fan3. The arching of the roof and its projection 9 enable the latter tocarry the weight of the motor and fan without requiring any separatebracing means.

The heating element or radiator 1 is secured to the side walls of theduct 2 by means of flanges 12 so as to be supported by the walls.

Arrows a indicate the direction of flow of the air through the heater.

In order to prevent excessive heating of the motor 4 by the hot air, themotor is surrounded by .a cylindrical envelope 15 the inner end 16 ofwhich extends into the immediate vicinity of the circumference of theboss 17 of the fan. The air flowing through the fan causes suction atthis point so that cool air from outside is drawn into the envelope 15and past the motor 4 as indicated by the arrows b and at the same timethe hot air is deflected to the outside and away from the motor.

If desired, conduits for drawing in cooling air from more remote pointsmay be provided.

I wish it to be understood that I do not desire to be limited to theexact details of construction shown and described, for obviousmodifications will occur to a person skilled in the art.

I claim 1. An air heater comprising a frame adapted to be fixed to aWall, a casin fixed to and projecting from said frame an open at thebottom to allow the inflow of air and a substantially circular airoutlet in the top part of its front wall opposite said frame,

the roof portion of said casing being arched and to act as bracingmember for said casing, a heating element in the bottom-open ing of thecasing, a fanin said air outlet,

a motor in front ofsaid fan outside of said casing and motor supportingmeans suspended from'said bracing member. A

2. An air heater comprising a frame adapted to befixed to a- WalL' acasing fixed toand projecting from said frame and open at the bottom toallow the inflow of air and asubs'tantiallyjcircnlar'air outlet in thetop part of its front Wall opposite said frame,

the roof portion of said casingbqi to 'matchthe curvature ofsaid Ii!outlet and to act as bracing member for said casing, said roof portionproject beyond said front wall to form anarc ed penthouse-likeextension, a heatin element in thebottom opening of the casmg, a, fan insaid air'outlet, a motor in front of said fan outside of said casingand: motbr mpporting means suspended from said extension.

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